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IMB & IMBL High Denition Boundary Microphones
For Boardrooms, Teleconferencing & Government Facilities
™
red illumination green illumination
IMBL30-B with LumiComm™ LED Touch Ring
and dual-color LEDs (red & green)
IMB30-W
(white nish)
Without LumiComm™ LED Touch Ring
IMB30-B
(black nish)
IMB30-SS
(stainless nish)
Architectural & Engineering
Specications
30kHz Omni
The microphone shall be a back-electret condenser
type with a wide-range uniform frequency response
of 60 Hz to 30kHz -3dB. The microphone shall be of
a single capsule, single membrane design with an
impulse response rise time no longer than 25 microseconds, and total settling time, including rise time,
no longer than 120 microseconds. The microphone
shall have polar characteristics uniform in all planes
to form an omni semisphere of revolution and shall
accept sound pressure levels up to 136dB producing
no more than 3%THD. IMBL models shall have a LumiComm™ dual-color touch ring with colors of red and
green, which are externally powered by 8-28 VDC @
85-170mA via a Phoenix or RJ45 connector mounted
on the microphone’s external pc board. The touch ring
will emit a momentary digital pulse from its external pc
board connector to activate external systems or equipment. The microphone shall be resistant to RF interference from cell phones and other RF devices. The
microphone body threading shall use the NPT standard of 1.660 in. (42.16mm) outer diameter 0.08696
in. (2.20878mm) thread pitch. The microphone shall
be terminated with a male XLR-3 connector and shall
require 24-48V phantom power. The microphone shall
be made of metal with a choice of nish. The Earthworks IMBL30 light ring model, or IMB30 non-LED
model (in black, white or stainless) is specied.
• High Denition Boundary Microphones™ for Conference Rooms and
Fixed Sound Installations
• True Semisphere™ Polar Response
(near-perfect frequency response at 0º, 45º &
90º)
• Very High Intelligibility
• LumiComm™ Programmable LED
Touch Ring (with red and green LEDs)
• Non-Touch Ring Models Available
• Can be Installed in Conference
Tables (includes lock nut)
• 60Hz to 30kHz Frequency Response
• RF Shielding against cell phones
and other RF devices
• 136dB Max Acoustic Input
• Requires 24-48V Phantom Power
• Available in Black, White or
Stainless Steel
Earthworks IMB & IMBL Series™
Boundary Layer Microphones
The IMB & IMBL boundary microphones provide a
low prole, pristine sounding microphone solution
for permanent sound installations. The extended
high frequency response to 30kHz and True Semisphere™ polar response allow those speaking to
maintain the same intelligibility at the front and
sides of the microphone without a loss of high
frequencies. In addition, the extremely fast diaphragm settling time allows more subtle details
of the human voice to be reproduced, which adds
to the amazing clarity and intelligibility of these
microphones. A prominent feature of the IMBL
microphones is the LumiComm™ LED Touch Ring
(with dual color LEDs in red & green) that is touch
sensitive and can be used to turn the microphone
either on or off, or any other programmed function, simply by touching the light ring. The IMBL
system interface board will allow the touch ring to
be programmed by standard system interfaces or
logic control systems. The IMBL system interface
board is powered from an external power source
of 8 to 28VDC @ 85-170 mA (current is depen-
dent upon number of LEDs illuminated at one
time). The IMB and IMBL Boundary High Deni-
tion Microphones™ will provide exceptional sound
quality, with very high intelligibility at virtually all
angles and distances.
Polar Response
Frequency Response
High Denition Boundary Microphones™ for
Fixed Installations
The Earthworks IMB & IMBL Series™ High Denition Boundary Microphones™ are the perfect
choice for high quality sound system installations. You will experience clarity and intelligibility as never before. The exceptional extended
high frequency response, remarkably fast diaphragm settling time and near-perfect polar response all work together to provide the world’s
best boundary microphones. The IMB & IMBL
Series™ provides you with the perfect low pro-
le solution for conference tables, conference
rooms and a wide variety of sound installations,
while providing the ultimate in sound quality.
Near-Perfect Polar Response
David Blackmer, founder of dbx® and Earthworks® invented a number of new microphone
technologies resulting in a totally new approach
to microphone design. One such technology was
the creation of near-perfect polar response. When
you look at the polar response of an Earthworks
microphone, the mid-frequencies, high-frequencies and low-frequencies all look very close to a
“textbook” perfect polar pattern. In practice this
means the polar response of an Earthworks microphone is extremely uniform over its operating
frequency range; the frequency response at 90º
and 180º off-axis is very close to the on-axis response. This uniform polar response results in
less phase problems and much higher intelligibility at the sides of the microphone.
Specications & Dimensions
are on back of this page
Expertly Hand Made in the U.S.A.
Earthworks, Inc. • 37 Wilton Rd. • Milford, NH 03055 • (603) 654-2433, ext 114 • email: sales@ear thworksaudio.com • earthworksaudio.com
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IMB & IMBL
High Definition Boundary Microphones™
For Conference Rooms & Fixed Sound Installations
Mic Tip
Touch Sensitive Ring
Light Ring
Vibration Damper
Washer
Lock Washer
Light Ring Connector
Tabletop
XLR Connector
(audio out)
Recommended Microphone Placement
IMB30
IMBL30
30° to 60°
recommended
range of angles
18 inches (45.72cm)
minimum from edge of table
Installation
● Mounting hole: Ø 1 1/16” (27 mm)
● Install in a hard surface, such as a table, ceiling or wall.
● Vibration damper provides isolation from mounting surface.
● Do not overtighten washer, as this reduces shock isolation.
IMB SERIES
SPECIFICATIONS
Frequency Response:
Polar Pattern:
Sensitivity:
Power requirements:
Max Acoustic Input:
Output Impedance:
Min. Output Load:
Light Ring LED Colors:
Light Ring Connector:
Light Ring Voltage:
Light Ring Activation:
Microphone Color
Dimensions:
60Hz to 30kHz -3dB @ 1 ft. (30cm)
Omni Semisphere
60mV/Pa
24-48V Phantom, 10mA
136dB SPL
Output:
XLR-3 (pin 2+)
65 ohms balanced
1K between pins 2 & 3
Noise:
20dB SPL (A weighted)
Dual Red or Green
Phoenix or RJ45
8-28VDC @ 85-170mA
Momentary Digital Pulse
Black, White or Stainless Steel
See drawings on right side of page
Weight:
0.28 lbs. (125g)
IMB Dimensions
IMBL Dimensions
Earthworks, Inc. • 37 Wilton Rd. • Milford, NH 03055 • (603) 654-2433, ext 114 • email: sales@ear thworksaudio.com • earthworksaudio.com
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